1/* 2 * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26/* @test 27 * @bug 8139885 28 * @bug 8143798 29 * @run testng/othervm -ea -esa test.java.lang.invoke.SpreadCollectTest 30 */ 31 32package test.java.lang.invoke; 33 34import java.io.StringWriter; 35import java.lang.invoke.MethodHandle; 36import java.lang.invoke.MethodHandles; 37import java.lang.invoke.MethodHandles.Lookup; 38import java.lang.invoke.MethodType; 39import java.lang.invoke.WrongMethodTypeException; 40import java.util.*; 41 42import static java.lang.invoke.MethodType.methodType; 43 44import static org.testng.AssertJUnit.*; 45 46import org.testng.annotations.*; 47 48/** 49 * Tests for the new asSpreader/asCollector API added in JEP 274. 50 */ 51public class SpreadCollectTest { 52 53 static final Lookup LOOKUP = MethodHandles.lookup(); 54 55 @Test 56 public static void testAsSpreader() throws Throwable { 57 MethodHandle spreader = SpreadCollect.MH_forSpreading.asSpreader(1, int[].class, 3); 58 assertEquals(SpreadCollect.MT_spreader, spreader.type()); 59 assertEquals("A456B", (String) spreader.invoke("A", new int[]{4, 5, 6}, "B")); 60 } 61 62 @Test 63 public static void testAsSpreaderExample() throws Throwable { 64 // test the JavaDoc asSpreader-with-pos example 65 MethodHandle compare = LOOKUP.findStatic(Objects.class, "compare", methodType(int.class, Object.class, Object.class, Comparator.class)); 66 MethodHandle compare2FromArray = compare.asSpreader(0, Object[].class, 2); 67 Object[] ints = new Object[]{3, 9, 7, 7}; 68 Comparator<Integer> cmp = (a, b) -> a - b; 69 assertTrue((int) compare2FromArray.invoke(Arrays.copyOfRange(ints, 0, 2), cmp) < 0); 70 assertTrue((int) compare2FromArray.invoke(Arrays.copyOfRange(ints, 1, 3), cmp) > 0); 71 assertTrue((int) compare2FromArray.invoke(Arrays.copyOfRange(ints, 2, 4), cmp) == 0); 72 } 73 74 @DataProvider 75 static Object[][] asSpreaderIllegalPositions() { 76 return new Object[][]{{-7}, {3}, {19}}; 77 } 78 79 @Test(dataProvider = "asSpreaderIllegalPositions") 80 public static void testAsSpreaderIllegalPos(int p) throws Throwable { 81 boolean caught = false; 82 try { 83 SpreadCollect.MH_forSpreading.asSpreader(p, Object[].class, 3); 84 } catch (IllegalArgumentException iae) { 85 assertEquals("bad spread position", iae.getMessage()); 86 caught = true; 87 } 88 assertTrue(caught); 89 } 90 91 @Test(expectedExceptions = {WrongMethodTypeException.class}) 92 public static void testAsSpreaderIllegalMethodType() { 93 MethodHandle h = MethodHandles.dropArguments(MethodHandles.constant(String.class, ""), 0, int.class, int.class); 94 MethodHandle s = h.asSpreader(String[].class, 1); 95 } 96 97 @Test 98 public static void testAsCollector() throws Throwable { 99 MethodHandle collector = SpreadCollect.MH_forCollecting.asCollector(1, int[].class, 1); 100 assertEquals(SpreadCollect.MT_collector1, collector.type()); 101 assertEquals("A4B", (String) collector.invoke("A", 4, "B")); 102 collector = SpreadCollect.MH_forCollecting.asCollector(1, int[].class, 2); 103 assertEquals(SpreadCollect.MT_collector2, collector.type()); 104 assertEquals("A45B", (String) collector.invoke("A", 4, 5, "B")); 105 collector = SpreadCollect.MH_forCollecting.asCollector(1, int[].class, 3); 106 assertEquals(SpreadCollect.MT_collector3, collector.type()); 107 assertEquals("A456B", (String) collector.invoke("A", 4, 5, 6, "B")); 108 } 109 110 @Test 111 public static void testAsCollectorInvokeWithArguments() throws Throwable { 112 MethodHandle collector = SpreadCollect.MH_forCollecting.asCollector(1, int[].class, 1); 113 assertEquals(SpreadCollect.MT_collector1, collector.type()); 114 assertEquals("A4B", (String) collector.invokeWithArguments("A", 4, "B")); 115 collector = SpreadCollect.MH_forCollecting.asCollector(1, int[].class, 2); 116 assertEquals(SpreadCollect.MT_collector2, collector.type()); 117 assertEquals("A45B", (String) collector.invokeWithArguments("A", 4, 5, "B")); 118 collector = SpreadCollect.MH_forCollecting.asCollector(1, int[].class, 3); 119 assertEquals(SpreadCollect.MT_collector3, collector.type()); 120 assertEquals("A456B", (String) collector.invokeWithArguments("A", 4, 5, 6, "B")); 121 } 122 123 @Test 124 public static void testAsCollectorLeading() throws Throwable { 125 MethodHandle collector = SpreadCollect.MH_forCollectingLeading.asCollector(0, int[].class, 1); 126 assertEquals(SpreadCollect.MT_collectorLeading1, collector.type()); 127 assertEquals("7Q", (String) collector.invoke(7, "Q")); 128 collector = SpreadCollect.MH_forCollectingLeading.asCollector(0, int[].class, 2); 129 assertEquals(SpreadCollect.MT_collectorLeading2, collector.type()); 130 assertEquals("78Q", (String) collector.invoke(7, 8, "Q")); 131 collector = SpreadCollect.MH_forCollectingLeading.asCollector(0, int[].class, 3); 132 assertEquals(SpreadCollect.MT_collectorLeading3, collector.type()); 133 assertEquals("789Q", (String) collector.invoke(7, 8, 9, "Q")); 134 } 135 136 @Test 137 public static void testAsCollectorLeadingInvokeWithArguments() throws Throwable { 138 MethodHandle collector = SpreadCollect.MH_forCollectingLeading.asCollector(0, int[].class, 1); 139 assertEquals(SpreadCollect.MT_collectorLeading1, collector.type()); 140 assertEquals("7Q", (String) collector.invokeWithArguments(7, "Q")); 141 collector = SpreadCollect.MH_forCollectingLeading.asCollector(0, int[].class, 2); 142 assertEquals(SpreadCollect.MT_collectorLeading2, collector.type()); 143 assertEquals("78Q", (String) collector.invokeWithArguments(7, 8, "Q")); 144 collector = SpreadCollect.MH_forCollectingLeading.asCollector(0, int[].class, 3); 145 assertEquals(SpreadCollect.MT_collectorLeading3, collector.type()); 146 assertEquals("789Q", (String) collector.invokeWithArguments(7, 8, 9, "Q")); 147 } 148 149 @Test 150 public static void testAsCollectorNone() throws Throwable { 151 MethodHandle collector = SpreadCollect.MH_forCollecting.asCollector(1, int[].class, 0); 152 assertEquals(SpreadCollect.MT_collector0, collector.type()); 153 assertEquals("AB", (String) collector.invoke("A", "B")); 154 } 155 156 @DataProvider 157 static Object[][] asCollectorIllegalPositions() { 158 return new Object[][]{{-1}, {17}}; 159 } 160 161 @Test(dataProvider = "asCollectorIllegalPositions") 162 public static void testAsCollectorIllegalPos(int p) { 163 boolean caught = false; 164 try { 165 SpreadCollect.MH_forCollecting.asCollector(p, int[].class, 0); 166 } catch (IllegalArgumentException iae) { 167 assertEquals("bad collect position", iae.getMessage()); 168 caught = true; 169 } 170 assertTrue(caught); 171 } 172 173 @Test 174 public static void testAsCollectorExample() throws Throwable { 175 // test the JavaDoc asCollector-with-pos example 176 StringWriter swr = new StringWriter(); 177 MethodHandle swWrite = LOOKUP. 178 findVirtual(StringWriter.class, "write", methodType(void.class, char[].class, int.class, int.class)). 179 bindTo(swr); 180 MethodHandle swWrite4 = swWrite.asCollector(0, char[].class, 4); 181 swWrite4.invoke('A', 'B', 'C', 'D', 1, 2); 182 assertEquals("BC", swr.toString()); 183 swWrite4.invoke('P', 'Q', 'R', 'S', 0, 4); 184 assertEquals("BCPQRS", swr.toString()); 185 swWrite4.invoke('W', 'X', 'Y', 'Z', 3, 1); 186 assertEquals("BCPQRSZ", swr.toString()); 187 } 188 189 static class SpreadCollect { 190 191 static String forSpreading(String s1, int i1, int i2, int i3, String s2) { 192 return s1 + i1 + i2 + i3 + s2; 193 } 194 195 static String forCollecting(String s1, int[] is, String s2) { 196 StringBuilder sb = new StringBuilder(s1); 197 for (int i : is) { 198 sb.append(i); 199 } 200 return sb.append(s2).toString(); 201 } 202 203 static String forCollectingLeading(int[] is, String s) { 204 return forCollecting("", is, s); 205 } 206 207 static final Class<SpreadCollect> SPREAD_COLLECT = SpreadCollect.class; 208 209 static final MethodType MT_forSpreading = methodType(String.class, String.class, int.class, int.class, int.class, String.class); 210 static final MethodType MT_forCollecting = methodType(String.class, String.class, int[].class, String.class); 211 static final MethodType MT_forCollectingLeading = methodType(String.class, int[].class, String.class); 212 213 static final MethodHandle MH_forSpreading; 214 static final MethodHandle MH_forCollecting; 215 static final MethodHandle MH_forCollectingLeading; 216 217 static final MethodType MT_spreader = methodType(String.class, String.class, int[].class, String.class); 218 static final MethodType MT_collector0 = methodType(String.class, String.class, String.class); 219 static final MethodType MT_collector1 = methodType(String.class, String.class, int.class, String.class); 220 static final MethodType MT_collector2 = methodType(String.class, String.class, int.class, int.class, String.class); 221 static final MethodType MT_collector3 = methodType(String.class, String.class, int.class, int.class, int.class, String.class); 222 static final MethodType MT_collectorLeading1 = methodType(String.class, int.class, String.class); 223 static final MethodType MT_collectorLeading2 = methodType(String.class, int.class, int.class, String.class); 224 static final MethodType MT_collectorLeading3 = methodType(String.class, int.class, int.class, int.class, String.class); 225 226 static final String NONE_ERROR = "zero array length in MethodHandle.asCollector"; 227 228 static { 229 try { 230 MH_forSpreading = LOOKUP.findStatic(SPREAD_COLLECT, "forSpreading", MT_forSpreading); 231 MH_forCollecting = LOOKUP.findStatic(SPREAD_COLLECT, "forCollecting", MT_forCollecting); 232 MH_forCollectingLeading = LOOKUP.findStatic(SPREAD_COLLECT, "forCollectingLeading", MT_forCollectingLeading); 233 } catch (Exception e) { 234 throw new ExceptionInInitializerError(e); 235 } 236 } 237 238 } 239 240} 241